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Peculiar Bi-ion dynamics in Na1/2Bi1/2TiO3from terahertz and microwave dielectric spectroscopy

Petzelt, Jan ; Nuzhnyy, Dmitry ; Bovtun, Viktor ; Paściak, Marek ; Kamba, Stanislav ; Dittmer, Robert ; Svirskas, Šarunas ; Banys, Juras ; Rödel, Jürgen :
Peculiar Bi-ion dynamics in Na1/2Bi1/2TiO3from terahertz and microwave dielectric spectroscopy.
[Online-Edition: http://dx.doi.org/10.1080/01411594.2014.953517]
In: Phase Transitions, 87 (10-11) pp. 953-965. ISSN 0141-1594
[Artikel], (2014)
Note:

SFB 595 A1

Offizielle URL: http://dx.doi.org/10.1080/01411594.2014.953517

Kurzbeschreibung (Abstract)

Dynamics of the main dielectric anomaly in Na1/2Bi1/2TiO3 (NBT) were studied by time-domain THz and microwave spectroscopy, using also previously published data and their new overall fits. Above the dielectric maximum temperature Tm ≈ 600 K, the response consists of coupled sub-THz oscillator and a relaxation mode, assigned to strongly anharmonic Bi-ion vibrations and hopping, whose slowing down explains the paraelectric-like permittivity increase to Tm. Below Tm, the main relaxation continues slowing down and additional relaxation, assigned to quasi-Debye losses, appears in the 1011 Hz range. The oscillator hardens on cooling and takes over the whole oscillator strength. The permittivity decrease below Tm is caused by the reduced strength of the relaxations due to dominance of the rhombohedral phase within the coexistence region with the tetragonal phase. The anharmonic dynamics of Bi are supported by previous structural studies. NBT represents a hybrid between standard and relaxor ferroelectric behaviour.

Typ des Eintrags: Artikel
Erschienen: 2014
Autor(en): Petzelt, Jan ; Nuzhnyy, Dmitry ; Bovtun, Viktor ; Paściak, Marek ; Kamba, Stanislav ; Dittmer, Robert ; Svirskas, Šarunas ; Banys, Juras ; Rödel, Jürgen
Titel: Peculiar Bi-ion dynamics in Na1/2Bi1/2TiO3from terahertz and microwave dielectric spectroscopy
Sprache: Englisch
Kurzbeschreibung (Abstract):

Dynamics of the main dielectric anomaly in Na1/2Bi1/2TiO3 (NBT) were studied by time-domain THz and microwave spectroscopy, using also previously published data and their new overall fits. Above the dielectric maximum temperature Tm ≈ 600 K, the response consists of coupled sub-THz oscillator and a relaxation mode, assigned to strongly anharmonic Bi-ion vibrations and hopping, whose slowing down explains the paraelectric-like permittivity increase to Tm. Below Tm, the main relaxation continues slowing down and additional relaxation, assigned to quasi-Debye losses, appears in the 1011 Hz range. The oscillator hardens on cooling and takes over the whole oscillator strength. The permittivity decrease below Tm is caused by the reduced strength of the relaxations due to dominance of the rhombohedral phase within the coexistence region with the tetragonal phase. The anharmonic dynamics of Bi are supported by previous structural studies. NBT represents a hybrid between standard and relaxor ferroelectric behaviour.

Titel der Zeitschrift, Zeitung oder Schriftenreihe: Phase Transitions
Band: 87
(Heft-)Nummer: 10-11
Freie Schlagworte: sodium bismuth titanate, terahertz spectroscopy, broadband dielectric spectroscopy, phase-transition dynamics, Bi-ion dynamics
Fachbereich(e)/-gebiet(e): Fachbereich Material- und Geowissenschaften > Materialwissenschaften > Nichtmetallisch-Anorganische Werkstoffe
Zentrale Einrichtungen > Sonderforschungsbereich 595 > A - Synthese > A1
Fachbereich Material- und Geowissenschaften > Materialwissenschaften
Zentrale Einrichtungen > Sonderforschungsbereich 595 > A - Synthese
Zentrale Einrichtungen > Sonderforschungsbereich 595
Fachbereich Material- und Geowissenschaften
Zentrale Einrichtungen
Hinterlegungsdatum: 12 Dez 2014 08:48
Offizielle URL: http://dx.doi.org/10.1080/01411594.2014.953517
Zusätzliche Informationen:

SFB 595 A1

ID-Nummer: 10.1080/01411594.2014.953517
Sponsoren: The research was supported by the Czech Science Foundation (project 13-15110S). R. Dittmer acknowledges support from the German Research Foundation DFG within the collaborative research centre SFB595.
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